Adjustment for try-squares



l. WHITNEY.

l Try Square. N o.V 17,991. Patented Aug* `H, 18517.v

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UNITED STATES PATENT OFFICE.

JOEL WHITNEY, OF WINCHESTER, MASSACHUSETTS.

ADJUSTMENT FOR TRY-SQUARES.

Specification of Letters Patent No. 17 ,991, dated August 11, 1857.

To all whom t may concern Be it known that I, JOEL IVHITNEY, of Winchester, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Try-Squares, by which They may loe Adjusted at Pleasure; and I do hereby declare that the following is a full, clear, and eXact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon, in which- Figure l is a plan or side View; Fig. 2 is an edge View; Fig. 3 is the flattened pin removed; Fg. 4 is the eccentric pin removed; and Fig. 5 is a plan or side view with a portion of the beam removed, showing the form of the tongue and the position of the flattened pin, the eccentric pin, and the screws therein which hold the beam together.

The same letters refer to like parts in all the figures,

To enable others skilled in the art to make and use my invention, I will proceed to describe it-s construction and operation.

In the drawings herein referred to, a is the tongue, b is the beam, c is the flattened in, Z is the eccentric pin, e e are the screws which hold the beam together, f f are metal plates upon each side of the beam, and g is the center piece of the beam.

By referring to Fig. 2 it will be seen that the beam is madein three parts. The center piece is made of wood or some suitable material, with a slit in one end to receive the tongue. The outside pieces are made of metal plate and are secured firmly to the center piece by the screws e, e, which hold the beam together and secure the tongue in its proper position. The beam of the square may however be made wholly of metal and in two parts only. In Fig. 5 there is an oblong hole h, in the tongue to receive the flattened pin. This hole is made to fit closely to the flattened sides of the pin. There is also a circular hole z', made in the tongue which fits closely on to the eccentric pin, and also two other holes j and la, for the screws e, e. These holes are made large enough to allow the tongue to swing a little without interfering with the screws. The flattened pin and eccentric pin have journals turned on each end as represented in Figs. 3 and 4. These journals are closely fitted to .circular holes made in the metal plates as seen at Z and my in Fig. l. The eccentric pin as will be seen in Figs. l, 4 and 5 has a slot cut in one end to receive a screwdriver by which the eccentric may be turned at pleasure. By turning the eccentric pin the tongue will swing or vibrate in proportion to the throw of the eccentric. As the tongue swings, the oblong hole 7L., allows it to slide on the flattened pin, and the flattened pin being made to fill the hole the narrowest way, will always turn to favor the angle of the tongue. In Fig. l will be seen a line radiating from the center of the journal of the eccentric, and extending on to the plate a short distance beyond the journal. This line represents the tongue in a position perpendicular to the beam. If found necessary there may be other radial lines drawn on the plate, for a guide by which the tongue may be set at different angles when required. By this arrangement the tonguev of the square can be readily adjusted to the position required, simply by turning the eccentric pin.

Having thus fully described the construction and operation of my improvement on the try-square, I will proceed to point out the parts which I claim as my invention and desire to secure by Letters Patent.

I claim- The flattened pin working in -the slot in combination with the eccentric pin, arranged substantially in the manner and for the purpose herein described.

JOEL WHITNEY. Witnesses: l

CEAS. W. HAWKES, SAML. G. PARSONS. 

